Which number will replace the question mark (?) in the following series?
1, 2, 6, 12, ?, 72, 216
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 36
Each term is the one before it multiplied by 2 and by 3 in turn:
\(1\times2=2\), \(2\times3=6\), \(6\times2=12\)
Next: \(12\times3=36\)
Then \(36\times2=72\) and \(72\times3=216\), the two terms after the gap